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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3371fa8563d91b179233e43b983f9bd40d2bf3708c564d969b6dd38d7f816a34' 
  AND token = 'j/ZgMw799PRwHztGS17kRPNnvjZ+RcuwOPku1TFJO9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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