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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d448b2fbc4cb14af2b265508e5c595058d4521b0349446624b1dbb8ca36751' 
  AND token = 'BxLjZ2uu0wY4S7RRm+cFJi9nEGcRbaKBqBRsZqaH/Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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