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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bc41c758a1bc68f6cae54da6cf2a8b4c23cebe1c54d9b55812f60fa216d6df4' 
  AND token = 'COwyY80KbLy8aHI+Y3J/cg6ruqnlDK3pDj+oqx2lU28=' 
  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"
    }
  }
}