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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daabdf07f9d18d39077c9fc194b994ce42773c25c4c47c2decdbcb1b300351f8' 
  AND token = '+C7+M1uK+rqjFntytFgcvqz8LJ7mpLtnR5phy4WEOCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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