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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d436c77527787e9a5d3ea66e2412c7ca0da184cf46b3fc6d5ab1917b7ce167' 
  AND token = 'dwQ6KcCqRE4vuw3QeYB3heK+0XVas4Fztb9OB+g1Wr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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