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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e13ae5dd42b5fb50eacb7af267f84f361095c4cd11882067e3a25bd75a79d3' 
  AND token = 'nIwrrApjy+WOyRJY870uR/4I7HA6PaVlorrCS8VCjL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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