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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '541f92a9669456c25a6c31b110b1e68d0a9a37260366e3f3be436ebe7e426cc3' 
  AND token = 'TZNYGT08/vpmQtTRPVg5LS+fBei0lSc4cCo1B3KOqLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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