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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4d8b11dfa60d0546ff6a17a8b617ff5193f9e54ac989e0751c28009d887bc1' 
  AND token = 'AXa2SIDFr5WPwy0FwFPvxGVSLJ2mE3RExF5S43E8aKE=' 
  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"
    }
  }
}