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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7500dbf48aafac84b36a2478a3f4604cd398d0e9ff5f550af9711c4ff4fb9829' 
  AND token = '0Q6WfFuo2HNnvwIspcFpi9S/tRuP1hGbcTBsiUa8dEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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