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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20b40cb32f5482ccc18423bbd3aa9cf2ca850ab030de908e433fceec219fc5dc' 
  AND token = 'CetQ2mKpVpBO+XM1aotHOP3caxUWyw5oVjvAt/jb7Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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