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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562776bb3583f614cdf31c1e3ebc56f2f3c0354130be085b8c1524f2a6aa5321' 
  AND token = 'FN56NFs81wmrk91KC99grHiOr/RQ+Xmr/g7dn1Ew9Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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