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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca66dd05d1158ae1afc7ec88ac91b94c698d354846e7aad8cafa47e2b9cc7d76' 
  AND token = 'Ra2Ok8u94/VRm9uyONL+RRWFFEp41IIaPraHTHoA8To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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