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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542ee7c35cca7291b2362322bff5325e5f8010f30f6b6ebc7d930b32815d17a5' 
  AND token = 'sk2IPCCUe6T3Hwn9ImMUspzScpltQ6IplP88epn8HzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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