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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985db5315ff2e49e4e650fde27dc682e2459d008ce939ad8b1eadb7d6d5e0efe' 
  AND token = 'zQISBkgpSjgcGkm31DwJVO4XFWZZ62nfrTFrH1xal58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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