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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5f22073d8da705f4d1bd648ecf9a50dc8b14d36f3ecd4296ae6464dc46b877' 
  AND token = 'BJg74A6j1UVhtSpCfbe/04mTFoO51u+W549D1ES2on0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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