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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d530d09f35c551e583fc8d0d3a213b1fac072e8f95e9d18cd31d1a9d5dd217' 
  AND token = '/+UU+ZQO8s5QjNS1dd8iMwYPCuSRXEz0sTmofcJhulU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}