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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9381571d38cdb4eab12f707e9ec9d7d9155dee916523e34b8d7c86dfab34017' 
  AND token = 'trPOHqafcVpCXBrDrLcfibIA6Zpi9kVX+N6ycNx9ct0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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