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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f453bedec26b1f365c0351e37020669f8fda60e9c69175c88e247def9819fc' 
  AND token = '96/EkOA1JeXRsNqjZJyEbYx5C5WzHrSok4VlS3JYVW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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