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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af0801731c04fe6242ce7ce487a13989f58bf4d03e367773bb587c63689e9f0c' 
  AND token = 'Ketax1p65ztga0uYswK6pVkdyWLmW/lan6Ks7a5aFck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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