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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb9ee39613aa4f7651b228b6d0aae783ab6250d25f33a7e907a5414306eb5a2' 
  AND token = '//slhujFH1G3MzDD60Cl73gMV2yvSOqz2CTtKk5b9Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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