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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca4ea418105ec6049ae3d3160be49de886109ab510d759920ecbdc35a62582b' 
  AND token = 'YP+vstsrjbDVgRsUOS4qLWgVzb6Z0cSu8PEaq9cS/uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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