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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fc9ba65693ca4a95e744a5a1e0e18d2539abcfa71e6bb1aaaa28a12557f8d1' 
  AND token = 'I6EPQ/f8XZkB5eJodeusYZXAJgm8ARoLvx0hBuewHHU=' 
  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"
    }
  }
}