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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f84478ae8a5a90bfaf7434236b2f4cbd72f76292e14953f58362a05513c1631' 
  AND token = '4+QtdYCd8saMnG6qH/Qb8wGCA8g3nH29x9ehsfyCqMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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