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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1415c78e87b96cbb1ca4dd4bfc4ced097666c6418e5503a9cd7581645b1e515b' 
  AND token = 'L1XngqIu61QNESa6PYn18dQ7Hco0pEj6oZoljxb3meM=' 
  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"
    }
  }
}