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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bc7e1814e2d0fa82622a540297c538d0ede9c8b8d4c9ac69b04268227705ab9' 
  AND token = 'TuldYDamH5xYYnk7p6BK9qEjvnc55fEnd4L/0EyIEcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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