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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cec292f61f87b4d24be04cb97b46c6561d9762fcb8c0279bd58d66781858d7' 
  AND token = '0Ig9KpAkidT7iM1qug6n/AWrU4FjgcAqC8wscJNLgZA=' 
  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"
    }
  }
}