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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a58731db7edd6b2f20379119222e9dacaca5802de4d4c5cde2f9ffd229de02' 
  AND token = '051z8TwQHg9MFlIaWQNAq3K0kQuPf11JIEBGiHuO/MU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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