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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e7fa45d2522586fa0dd30b374c5ed4f2855629235a7480c7acf61fbdb0c82f' 
  AND token = 'HuYQinIB0lp/K3g0jWQCuwCx2ehSQ87fptqEBz6jsDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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