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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d010e13c75c7d763ab9b5aa2a1fb78affad00cf537867d6f658333ad12717ff' 
  AND token = 'rYmg5YCvGdedyHBZrcx8eKujy7xz+yL7J0LCza85eLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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