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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38a0e5b0f1577d1e5c85507cf264d415a8b1dae93a4b94e0de629b2fc66a4839' 
  AND token = 'FaF/cLA9Bls6pxasGC2LNeleAKLKhHUbvLgWtnwVIhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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