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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4e361d5ed066b3a027733816e4b199b8c418add9f016591f1d6a5952399680' 
  AND token = '4jqaRWei3k+2deyiWwRlCQBHL3/wrk0VTZdLEzvI/WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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