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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7973658200d66f1b5c96e2196ac8352fd19edcabc59c37fcec7ccfeb4f4a553' 
  AND token = '1FK+PIo55Nr3FjenpXBwI1u6amH0EbglUAuLdE1PL4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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