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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73410222512c933d940f3d1469efa153b7c825e6a9557d4fe0d2b40bd9bdfa93' 
  AND token = 'LroozIJEkb4q8qpJIwyUkacmyDPMC+iKxxn7sRPpnp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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