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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d2bc4dfb7d3de3e1cda88244b34e944b61aa6105453cd8920afc2ee7e35e36' 
  AND token = 'o8nCfk5MVUUj5aSgjJpklHp4LLPJ/a3W7H29PfaKkSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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