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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84248c4e25e9a12a4fc22bd2b47487ddbb90c1094f55c8455907440476a70966' 
  AND token = 'HUWDwtIcFx/i835zAcSYOR+V/RqWAE/XWgc2Clu6Wtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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