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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d1abc9c1e4e1311fbc684d031f091cd25522d0380d11019a60f34c6a35575e' 
  AND token = 'gIuq49xNIapCwoqgBjtJCgespFs1bfFuA2MLg/8mOl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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