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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d7e392be1a9cacf15ec2a8ab9099c33efef2a97778ad94d6da0fc6f98bf3bd' 
  AND token = 'pqAfP5fCDI0j6EpNhhH+aOR33hB/WBDX9BIY1CZzo2U=' 
  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"
    }
  }
}