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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683ad78c78c6c3e93833dbf4c4902e63af591d546a1fa2b0a03cc890e92a6861' 
  AND token = 'eFHwaXBqjjaKs/Xds9C3q93lM/dIH7QTSxIBix7TMp4=' 
  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"
    }
  }
}