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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c8de0f85ba11c64f87a28b81888d9ba8aa9f9ffb30629f8713f1be414a5ff5' 
  AND token = '9bgmmnmrBQ3SJw+hdQELAUQ1zWjXr3Hi07bZ2oSmj/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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