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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f5f1dbc9e9a82d97c4187ca6112d2662958f3ba48237ab0c594a95ccdf4bc2' 
  AND token = 'EAMguUtTN0xUidUlj5G7vxJELY9ZMhRGH2ARwaxeRIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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