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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82790ffefa0a5087d565f01f7213d2dd1231a7e32e1dd6267e20f9489cb2668d' 
  AND token = '0We1/PIUeyPE5qSAI4raIPpcqajEIom1kD3I6iU+voM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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