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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f610552622fb7697e73610a0e8608a0ea0408cb0bd9fdf84e78dd8dbb3d78b6f' 
  AND token = 'cs9xJzSDzkhZ9nx1uKtJFMVbb/SOVz3XSRN65ccrMvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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