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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa79eb33f1e78ff937f72ffa1a0c90b23eade2fcaf2829d094debe785b0e4c6' 
  AND token = 'cHWkNbg5OoKOvJGT7JcTUA9OfID4G4xFGmRzXr9J/D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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