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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f500ff66e1a35a1271667241c7b43aff64162fba1c34d27d9b15ee7f0062fd' 
  AND token = 'aSyVKfn2vMvhFdaCydS22xiXx4qEj7i+wn6rxY8P1qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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