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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a435585eaa9434b9172d7695c5bc4e5d5d505ced7acc90073c7a52fb945a91' 
  AND token = 'JWt+RRTSSI7ZB3Ue1DzUlU7J0KP2meOHQM4T1obLDh8=' 
  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"
    }
  }
}