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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8684c037bccd9044823f8c4097412139eb11fb8389bdbf863ba8b3482668d692' 
  AND token = 'kMgFK2EetWxiPBB2y6lFtE6svb4xXLJ4EaIfhVaB/PU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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