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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e1e2bd88f6cef558f20cfe7441527c30d7d3b86c2feaee7b2f65fbc7fd55b6' 
  AND token = 'Ub19kvxp32+rGWCwOM6V4zxdaopwOQLGE2erStm0OH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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