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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e598aab0e962c132eda05a4b9a55ae27a5748b3c82eab8a9863c55754f05735' 
  AND token = 'BAW983jiPy5R5ja+Rj1Ia28IB6kRAdOxEjddCMcMvZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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