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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81e739ebb019fd5509b9e8ece82d4d5b35484b29f2b8201f6292e9ba89931150' 
  AND token = 'VyHomjniNT8SV0xEeK18//RUJZJRp7Gj+XbBCMjnchE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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