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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '322d4f5f52b07941f3d3e35e2f083b19eb0975a401e07a6e04298bffb0646c11' 
  AND token = 'xpp05wkuXJhf++1I7rLzXR3u6+YDITI68NFM66J1Pus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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