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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5142c2cc49becd711a5b411566449df2184d8e3a231f7b4c6ff2e16bd2d618' 
  AND token = 'Jf9615ZqRSfDfxLbHnfc8pn5Fi8rIEANZbl3uPjelyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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