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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fc9738627d83117783a2271eb462e467f2d5df921176f336fda7d04b017c83' 
  AND token = 'Dz+GfMazziXtMu68GnMvSIwgtA74ngfoP6RsF6+32D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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