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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11275ba42280592286954109e09ec79679184f4a1a9ebeeab169edf365b56d8' 
  AND token = 'BySc1Sc14l1hKtQxOf3a52Wihqn+PxAJSkffmOh0iKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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