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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a7acada44a6b21a2a0fbf5acdf2a95196d39bbc826ff16ade394817e855a3' 
  AND token = '2B9MjSRPSU73AMi9KMZn8oEljiqNzcdYvJQRPBLIufo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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