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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f635aa788e85fbe9b1fe27d2824388dd13e721980ef7b916c1af71c9017e3fa' 
  AND token = '6CKQYeus+n4p9xJuzpLnVENy4+KK29j7ThjwzXtyjn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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