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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '722ddde059e6f1e856f38ca00414d2d19d9c0a8c70033ef3c5faec42b5185f79' 
  AND token = 'bTXztn7JFP1rnykKbKNsyXmx6afXbcCFLL54206GntM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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