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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fd52262ae64ef4bd1ac45e11c2343b9e867bbcd4e9af6654796e4195c06f0f' 
  AND token = 'ymRSPHDgJG7bGzwbPk03fmR+JrdurNnu1HetZnvg440=' 
  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"
    }
  }
}