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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfa5e382e884ddd7c58eff44338b344b71966a66c48d246e77b283648b9e281' 
  AND token = '1p9WJoJiG4OZ/011wYLC/qlYb1NP6BGRD5U8AByoeFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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