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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3ea2d77697b5971b2223ed21ec64bc91dbca978f74ad738b44ded48ac1957c' 
  AND token = 'CK8xQeBtWZB1xEJhxxBPtYHsPhBfspr9Qo8p0AhSnWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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